Cisco 15310-MA Guia de Resolução de Problemas descarregar pdf (Página 234)

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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, Release 9.0

78-18394-01

Chapter 2 Alarm Troubleshooting

Alarm Procedures

Step 9 If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport

for more information or call Cisco TAC (1-800-553-2447) in order to report a Service-Affecting (SA)

problem.

2.7.152 LOS (EC1)

Default Severity: Critical (CR), Service-Affecting (SA)

SONET Logical Object: EC1

LOS on a 15310-CL-CTX, DS1-28/DS3-EC1-3, or DS1-84/DS3-EC1-3 card EC-1 port occurs when a

SONET receiver detects an all-zero pattern for 10 microseconds or longer. An LOS (EC1) most likely

means that the upstream transmitter has failed. If an EC1 LOS alarm is not accompanied by additional

alarms, a cabling problem (such as an incorrect attachment, a fiber cut, or another fiber error) usually

causes this alarm. The condition clears when the problem is corrected, allowing two consecutive valid

frames to be received.

Note If a circuit shows a partial status when this alarm is raised, the logical circuit is in place. The circuit is

able to carry traffic when the connection issue is resolved. You do not need to delete the circuit when

troubleshooting this alarm.

Clear the LOS (EC1) Alarm

Step 1 Using site practice, verify cabling continuity to the port reporting the alarm.

Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15310-CL

or ONS 15310-MA.

Step 2 If the cabling is good, verify that the correct port is in service by completing the following steps:

a. Confirm that the ACT LED is green.

b. To determine whether the port is in service, double-click the card in CTC to display the card view.

c. Click the Provisioning > EC1 > Line tabs.

d. Verify that the Admin State column lists the port as IS.

e. If the Admin State column lists the port as OOS,MT or OOS,DSBLD, click the column and choose

IS. Click Apply.

Note If ports managed into IS administrative state are not receiving signals, the LOS alarm is

either raised or remains, and the port service state transitions to OOS-AU,FLT.

Step 3 If the correct port is in service, use an optical test set to confirm that a valid signal exists on the line. For

specific procedures to use the test set equipment, consult the manufacturer. Test the line as close to the

receiving port as possible.

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